. 2023 Nov 27;19(4):e1369. doi: 10.1002/cl2.1369
© 2023 The Authors. Campbell Systematic Reviews published by John Wiley & Sons Ltd on behalf of The Campbell Collaboration.
This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Figure 16.
World Health Organization regions.